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Income Taxes (Reasons For Differences Between Statutory Federal Tax Rate And Effective Income Tax Rate) (Details)
12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]      
Federal income tax rate 21.00% 24.50% 35.00%
State income taxes 2.90% 3.30% 2.30%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent (6.60%) (0.10%) (0.10%)
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent 0 (0.379) 0
Domestic production deduction 0.00% (1.70%) (3.10%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent 0.00% 3.10% 0.00%
Other (1.00%) (1.50%) (1.80%)
Effective income tax rate 16.30% (10.30%) 32.30%